Island



(No Model) 2 Sheets-Sheet 1.

J. W. SARGENT. EGOBNTRIG FOB. OPERATING VALVES or STEAM ENGINES.

No. 516,633. Patented Mar. 13, 1894.

Wti'naavdq I l Inn/6217227:

2 Sheets-Sheet 2.

(No Model.)

J. W. SARGENT. EGGENTRIG FOR OPERATING VALVES 0F STEAM ENGINES.

No. 516,633. Patented Mar. 13, 1894;

W232 380a. C?

E-AM J in TATES EPIC.

JOHN w. SARGENT, or PROVIDENCE, RHODE ISLAND.

SPECIFICATION forming part of Letters Patent No. 516,633, dated March13, 1894.

Application filed October 2, 1893. Serial No. 487,009. (No model.)

To to whom it may concern:

Be it known that 1, JOHN W. SARGENT, a citizen of the United States,residing at Provideuce, in the State of Rhode Island, have invented anew and useful Improvement in Eccent rics for Operating the Valves ofSteam- :ilngmes, of which the following is a specificaion.

I The object of my invention is to provide an improved mechanism foroperating the valves of a steam engine, when the said valves areconnected with a rocking side-shaft arranged usually at right angles to,and below the main shaft. And my invention consists in an eccentrichaving a peripheral groove, and a sphericalbearing surface between theeccentric and its strap, the said strap being provided with swivel pinsloosely fitting the groove of the eccentric and operating as guides tokeep the strap in its proper place.

My invention also consists in the combination of the said sphericaleccentric and strap, with the rocking shaft arranged at right angles toand below the main shaft.

Referring to the drawings: Figure 1, represents a side elevation of asteam engine provided with my improvement. Fig. 2, represents a sideview'of the eccentric at its lowest position. Fig. 3, represents asection taken on the line 3, 3, of Fig. 2. Fig. 4:, represents a sectiontaken on the line 4., 4, of Fig. 2. Fig. 5, represents a section takenin the same line, with the eccentric turned to its intermediateposition. Fig. 6, represents a section taken in the same line, with theeccentric in its highest position. Fig. 7, represents a side and an endview of the swivel pin.

In the accompanying drawings, A represents the main shaft of the engine,to which is fastened the eccentric B, the periphery a of the saideccentric being made in spherical form, to fit the spherically concavedform of the eccentric strap 0, which is made in two parts I), b, securedto each other by means of the bolts 0, c. The eccentric Bis providedcentrally with the peripheral groove d, and between the opposite ears e,e, of the parts I), b, of the eccentric strap, are placed the blocks f,f, perforated at g, to loosel receive the swivel pins h which enter thegroove dot the eccentric B, horizontally, at opposite sides of the saideccentric. The pins h are preferably provided with the heads 1',extending each way from the shank j, thus providing an extended wearingsurface, which bears against the side of the groove d, and they serve toprevent'the eccentric strap 0, from moving sidewise out of its normalposition, and also form a turning point for the lateral rocking movementof the said eccentric.

The rock shaft D which serves to operate the exhaust valves of the steamcylinder E, is provided at its end, next to the shaft A, with theoutwardly directed arm It, provided with the wrist pin 1, having at itsenda spherical knob 0, which is connected with the eccentric B by meansof the concave adjustable boxes m, 'm, held in the downwardly extendingarm n of the lower portion b of the occentric strap, thus forming withthe said eccentric strap a ball and socket joint. The revolution of themain shaft Aof the engine, will cause a rocking motion to be imparted tothe rock-shaft D, which operates the valves, and-as the knob o of thewrist pin Z, moves in the outwardly curved are of a circle describedabout the center of the rock-shaft D, which shaft is located below themain shaft A, and extends at right angles therewith,the eccentric strap0 will have a slight rocking motion laterally upon the eccentric B, thesaid eccentric strap turning about the axes of the pins'h, asillustrated in Figs. 4, 5, and 6, which show the eccentric in differentpositions relatively to the rock-shaft D, and the rocking arm 75 of thesaid shaft. The rock shaft D is shown at right angles to the main shaft,but it maybe arranged at any angle that is required.-

I claim as my invention 1. An eccentric, provided with a sphericalbearing surface. and the peripheral groove, and a concaved eccentricstrap, provided with the swivel pins fitting the groove of theeccentric, to prevent lateral displacement and form a turning point forthe lateral rocking movement of the eccentric strap, substantially asdescribed.

2. An eccentric, provided with a spherical bearing surface and thecircumferential 10c eccentric and the spherical knob of the wrist pincarried by the rocking arm, the swivel pins fitting the groove in theeccentric, and the holding blocks for the swivel pins, substantially asdescribed.

JOHN W. SARGENT.

Witnesses:

WM. B. WATERMAN, S. SCHOLFIELD.

